QT中对XML进行读写操作

#include <QtGui> #include <QtXml> #include <iostream> #include "xmlstreamreader.h" XmlStreamReader::XmlStreamReader(QTreeWidget *tree) { treeWidget = tree; } bool XmlStreamReader::readFile(const QString &fileName) { QFile file(fileName); if (!file.open(QFile::ReadOnly | QFile::Text)) { std::cerr << "Error: Cannot read file " << qPrintable(fileName) << ": " << qPrintable(file.errorString()) << std::endl; return false; } reader.setDevice(&file); reader.readNext(); while (!reader.atEnd()) { if (reader.isStartElement()) { if (reader.name() == "bookindex") { readBookindexElement(); } else { reader.raiseError(QObject::tr("Not a bookindex file")); } } else { reader.readNext(); } } file.close(); if (reader.hasError()) { std::cerr << "Error: Failed to parse file " << qPrintable(fileName) << ": " << qPrintable(reader.errorString()) << std::endl; return false; } else if (file.error() != QFile::NoError) { std::cerr << "Error: Cannot read file " << qPrintable(fileName) << ": " << qPrintable(file.errorString()) << std::endl; return false; } return true; } void XmlStreamReader::readBookindexElement() { reader.readNext(); while (!reader.atEnd()) { if (reader.isEndElement()) { reader.readNext(); break; } if (reader.isStartElement()) { if (reader.name() == "entry") { readEntryElement(treeWidget->invisibleRootItem()); } else { skipUnknownElement(); } } else { reader.readNext(); } } } void XmlStreamReader::readEntryElement(QTreeWidgetItem *parent) { QTreeWidgetItem *item = new QTreeWidgetItem(parent); item->setText(0, reader.attributes().value("term").toString()); reader.readNext(); while (!reader.atEnd()) { if (reader.isEndElement()) { reader.readNext(); break; } if (reader.isStartElement()) { if (reader.name() == "entry") { readEntryElement(item); } else if (reader.name() == "page") { readPageElement(item); } else { skipUnknownElement(); } } else { reader.readNext(); } } } void XmlStreamReader::readPageElement(QTreeWidgetItem *parent) { QString page = reader.readElementText(); if (reader.isEndElement()) reader.readNext(); QString allPages = parent->text(1); if (!allPages.isEmpty()) allPages += ", "; allPages += page; parent->setText(1, allPages); } void XmlStreamReader::skipUnknownElement() { reader.readNext(); while (!reader.atEnd()) { if (reader.isEndElement()) { reader.readNext(); break; } if (reader.isStartElement()) { skipUnknownElement(); } else { reader.readNext(); } } }